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Cisco 886 Slow pppoe belgacom over isdn

Yordi Mahieu


for a costumer i have replaced there old small home router with this cisco 886.

i have configurd the atm interface, and the dialer interface.

i get a ip adres in the dialer from the isp , and i have internet connection.

everyting works except it is VERRY SLOW if i check the internet connection speed it is 0.49 Mbps down and 0.42 Mbps up (

normaly i would get almost 4 Mbps download !

i have checkt with Belgacom (isp) the cabel and everyting is ok ! (with the previos router full speed internet! )

some portion of the config is included !

i tryed to put encapsulation on the atm aal5snap and aal5mux .... no diffrens...

interface ATM0

no ip address

no atm ilmi-keepalive

pvc 8/35

  pppoe-client dial-pool-number 1


interface Dialer1

mtu 1492

ip address negotiated

ip access-group naar-binnen in

ip nat outside

ip virtual-reassembly in

encapsulation ppp

dialer pool 1

ppp authentication chap callin

ppp chap hostname ######@SKYNET

ppp chap password 7 ############

31 Replies 31

paolo bevilacqua
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

Post 'show dsl interface'

not a valid command ?

my show version i have a dsl controler !

Cisco 886VA (MPC8300) processor (revision 1.0) with 236544K/25600K bytes of memory.
Processor board ID FCZ163491FJ

1 DSL controller
1 Ethernet interface
4 FastEthernet interfaces
1 ISDN Basic Rate interface
1 ATM interface
1 Virtual Private Network (VPN) Module
256K bytes of non-volatile configuration memory.
125496K bytes of ATA CompactFlash (Read/Write)

License Info:

License UDI:

Device#   PID                   SN
*0        CISCO886VA-SEC-K9     FCZ163491FJ


i have a ADSL ISDN interface (wich is connected to the ISP)

and i have a BRI interface (not used : this is for pstn fallback i think)

is this the way ?

i have this with show atp pvc 8/35

and show ip interf brief

I see no pppoe connection ? but i have internet connection and a ip from my isp ?

router-ilc#show atm pvc 8/35

Description: N/A

ATM0: VCD: 1, VPI: 8, VCI: 35

UBR, PeakRate: 512 (1208 cps)

AAL5-LLC/SNAP, etype:0x0, Flags: 0x1840, VCmode: 0x0, Encapsize: 12

OAM frequency: 0 second(s), OAM retry frequency: 1 second(s)

OAM up retry count: 3, OAM down retry count: 5

OAM END CC Activate retry count: 3, OAM END CC Deactivate retry count: 3

OAM END CC retry frequency: 30 second(s),

OAM SEGMENT CC Activate retry count: 3, OAM SEGMENT CC Deactivate retry count: 3

OAM SEGMENT CC retry frequency: 30 second(s),

OAM Loopback status: OAM Disabled

OAM VC Status: Not Managed

OAM Loop detection: Disabled

ILMI VC status: Not Managed

InARP frequency: 15 minutes(s)

High Watermark: 0, Low Watermark: 0

InPkts: 80315, OutPkts: 50994, InBytes: 102161588, OutBytes: 9642421

InPRoc: 597, OutPRoc: 111, Broadcasts: 0

InFast: 79718, OutFast: 50067, InAS: 0, OutAS: 0

InPktDrops: 0, OutPktDrops: 0/0/0 (holdq/outputq/total)

CrcErrors: 0, SarTimeOuts: 0, OverSizedSDUs: 0, LengthViolation: 0, CPIErrors: 0

Out CLP=1 Pkts: 0

OAM cells received: 0

F5 InEndloop: 0, F5 InSegloop: 0,

F5 InEndcc: 0, F5 InSegcc: 0, F5 InAIS: 0, F5 InRDI: 0

OAM cells sent: 0

F5 OutEndloop: 0, F5 OutSegloop: 0,

F5 OutEndcc: 0, F5 OutSegcc: 0, F5 OutAIS: 0, F5 OutRDI: 0

OAM cell drops: 0

Status: UP

PPPOE enabled. Current number of pppoe sessions: 0

router-ilc#show ip interface brie

Interface                  IP-Address      OK? Method Status                Protocol

ATM0                       unassigned      YES NVRAM  up                    up

BRI0                       unassigned      YES NVRAM  administratively down down

BRI0:1                     unassigned      YES unset  administratively down down

BRI0:2                     unassigned      YES unset  administratively down down

Dialer1            YES IPCP   up                    up

Ethernet0                  unassigned      YES NVRAM  administratively down down

FastEthernet0              unassigned      YES unset  up                    up

FastEthernet1              unassigned      YES unset  up                    up

FastEthernet2              unassigned      YES unset  up                    up

FastEthernet3              unassigned      YES unset  up                    up

NVI0                       unassigned      YES unset  administratively down down

Virtual-Access1            unassigned      YES unset  up                    up

Virtual-Access2            unassigned      YES unset  up                    up

Vlan1               YES NVRAM  up                    up

You are right.           

Post "show controller vdsl 0".

Controller VDSL 0 is UP

Daemon Status:           Up

                        XTU-R (DS)              XTU-C (US)
Chip Vendor ID:         'BDCM'                   'ALCB'
Chip Vendor Specific:   0x0000                   0x0000
Chip Vendor Country:    0xB500                   0xB500
Modem Vendor ID:        'CSCO'                   '    '
Modem Vendor Specific:  0x4602                   0x0000
Modem Vendor Country:   0xB500                   0x0000
Serial Number Near:    FCZ163491FJ 886VA-S 15.2(3)
Serial Number Far:
Modem Version Near:    15.2(3)
Modem Version Far:     0x0000

Modem Status:            TC Sync (Showtime!)
DSL Config Mode:         AUTO
Trained Mode:            G.992.1 (ADSL) Annex B
TC Mode:                 ATM
Selftest Result:         0x00
DELT configuration:      disabled
DELT state:              not running
Trellis:                 ON                       ON
SRA:                     disabled                        disabled
SRA count:              0                       0
Bit swap:                enabled                         enabled
Bit swap count:         0                       0
Line Attenuation:         0.0 dB                  2.0 dB
Signal Attenuation:       0.0 dB                  0.0 dB
Noise Margin:            22.2 dB                  9.0 dB
Attainable Rate:        9312 kbits/s             848 kbits/s
Actual Power:             7.4 dBm                 5.6 dBm
Total FECC:             0                        0
Total ES:               0                        0
Total SES:              0                        0
Total LOSS:             0                        0
Total UAS:              0                        0
Total LPRS:             0                        0
Total LOFS:             0                        0
Total LOLS:             0                        0

Full inits:             1
Failed full inits:      0
Short inits:            0
Failed short inits:     0

Firmware        Source          File Name (version)
--------        ------          -------------------
VDSL            embedded        VDSL_LINUX_DEV_01212008 (1)

Modem FW  Version:      110331_1212-4.02L.03.B2pvC032b.d23f
Modem PHY Version:      B2pvC032b.d23f
Vender Version:

                  DS Channel1     DS Channel0   US Channel1       US Channel0
Speed (kbps):             0             4640             0               512
SRA Previous Speed:       0                0             0                 0
Previous Speed:           0                0             0                 0
Total Cells:              0         44256120             0                 0
User Cells:               0          2215117             0                 0
Reed-Solomon EC:          0                0             0                 0
CRC Errors:               0                0             0                 0
Header Errors:            0                0             0                 0
Interleave (ms):       0.00             0.25          0.00              0.25
Actual INP:            0.00             0.00          0.00              0.00

Training Log :  Stopped
Training Log Filename : flash:vdsllog.bin

i see my vdsl is connectec with DS channel0  4640 ... so the hardware speed is ok ..

Try updating VDSL FW to


any help with that pleas, did not do that before ....

i need a service contrac to download this file.... i am a partner but i have no service contract.. kan you zip it to me ?

Sorry, I'm not allowed to redistribute Cisco software.

is there a other posibility why it is so slow ?

why is there nog pppoe connection ? but i have internet access.

As mentioned before, usually it is due to bugs in DSL firmware, sometime IOS bugs.

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